Senior Fullstack Engineer
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Job Description
Senior Fullstack Engineer building Node.js and AWS services for a UK-based retail and financial services organisation. Using AI coding tools to deliver secure, scalable payments and fraud integrations.
Responsibilities:
- Design, develop, and maintain production-grade Node.js applications and services
- Use AI coding agents such as Claude Code and Cursor as core development tools
- Translate product and business requirements into robust technical solutions
- Use AI for development, refactoring, debugging, testing, documentation, and code generation while maintaining ownership of the resulting code
- Build and integrate APIs with third-party commercial software
- Develop integrations across payments, fraud, originations, and financial infrastructure
- Use AWS services to deploy, operate, and scale applications
- Review and improve AI-generated code for security, performance, reliability, and maintainability
- Refactor legacy or externally developed systems into clean, maintainable Node.js services
- Write automated tests and ensure appropriate engineering quality gates
- Troubleshoot production issues and contribute to observability and operational improvements
- Collaborate with product, engineering, and business stakeholders
- Make pragmatic architectural decisions in a fast-moving environment
Requirements:
- Strong commercial experience with Node.js / JavaScript / TypeScript
- Strong API and backend development experience
- Experience building and integrating REST APIs and other service interfaces
- Strong understanding of software architecture and engineering principles
- Experience working with AWS
- Experience with databases and data modelling
- Experience with automated testing and CI/CD
- Experience integrating third-party SaaS and API platforms
- Strong knowledge of Git and modern software development practices
- Experience using AI coding tools such as Claude Code, Cursor, GitHub Copilot, or similar
- FinTech or financial services experience is preferred
- Strong English communication skills, both written and verbal
- Ability to work independently and effectively in a fast-moving engineering environment
- Strong problem-solving skills and a practical, hands-on approach to development
Benefits:
- Remote work arrangement
- Opportunity to work with modern cloud technology and AI-driven software development
- Opportunity to work with Node.js, AWS, APIs, and AI development tools
- Interview process typically takes about 45 minutes at most
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